Path Tool

[Ofnuts]

Completely different solution:

• Create an image with is the size of the road times N (or N*M)
  
• Fill a red layer
  
• Fill a green layer over it
  

• Set the green layer to Dissolve mode and reduce opacity taste
  
• Split the layer into N (or N*M) stacked layers (see ofn-layer-tiles for instance)
  
• Make a circle selection, invert it and clear the selection in all layers (see clear-layers, for instance)
  
• At that point you have an image made of many layers that are all red circles with random green dots
  

   

• Export the image as a Gimp Image Hose (.gih) brush in one of our brushes directory
  

   

• Refresh your brushes list, select the brush and there you go (you can use the brush manually or stroke a path with it).:
  

   

ZIP with GIH brush and XCF source: